[ovs-dev] [PATCH] ofproto-dpif: Add more details to "ofproto/trace" output.
Ben Pfaff
blp at nicira.com
Tue Jul 24 20:39:43 UTC 2012
Thanks, I pushed this to master.
On Tue, Jul 24, 2012 at 01:27:58PM -0700, Ethan Jackson wrote:
> Looks good, really good idea. Thanks.
>
> Ethan
>
> On Tue, Jul 24, 2012 at 1:06 PM, Ben Pfaff <blp at nicira.com> wrote:
> > There are many reasons why OFPP_NORMAL translation can drop packets, and
> > it's often far from obvious why. This should make it easier to debug.
> >
> > Bug #12618.
> > Signed-off-by: Ben Pfaff <blp at nicira.com>
> > ---
> > ofproto/ofproto-dpif.c | 51 +++++++++++++++++++++++++++++++++++++++++++----
> > 1 files changed, 46 insertions(+), 5 deletions(-)
> >
> > diff --git a/ofproto/ofproto-dpif.c b/ofproto/ofproto-dpif.c
> > index dc15c15..c25c513 100644
> > --- a/ofproto/ofproto-dpif.c
> > +++ b/ofproto/ofproto-dpif.c
> > @@ -243,6 +243,11 @@ struct action_xlate_ctx {
> > * calling action_xlate_ctx_init(). */
> > void (*resubmit_hook)(struct action_xlate_ctx *, struct rule_dpif *rule);
> >
> > + /* If nonnull, flow translation calls this function to report some
> > + * significant decision, e.g. to explain why OFPP_NORMAL translation
> > + * dropped a packet. */
> > + void (*report_hook)(struct action_xlate_ctx *, const char *s);
> > +
> > /* If nonnull, flow translation credits the specified statistics to each
> > * rule reached through a resubmit or OFPP_TABLE action.
> > *
> > @@ -299,6 +304,8 @@ static void compose_slow_path(const struct ofproto_dpif *, const struct flow *,
> > const struct nlattr **actionsp,
> > size_t *actions_lenp);
> >
> > +static void xlate_report(struct action_xlate_ctx *ctx, const char *s);
> > +
> > /* A subfacet (see "struct subfacet" below) has three possible installation
> > * states:
> > *
> > @@ -5570,6 +5577,7 @@ action_xlate_ctx_init(struct action_xlate_ctx *ctx,
> > ctx->may_learn = packet != NULL;
> > ctx->tcp_flags = tcp_flags;
> > ctx->resubmit_hook = NULL;
> > + ctx->report_hook = NULL;
> > ctx->resubmit_stats = NULL;
> > }
> >
> > @@ -5696,6 +5704,14 @@ xlate_actions_for_side_effects(struct action_xlate_ctx *ctx,
> > xlate_actions(ctx, ofpacts, ofpacts_len, &odp_actions);
> > ofpbuf_uninit(&odp_actions);
> > }
> > +
> > +static void
> > +xlate_report(struct action_xlate_ctx *ctx, const char *s)
> > +{
> > + if (ctx->report_hook) {
> > + ctx->report_hook(ctx, s);
> > + }
> > +}
> >
> > /* OFPP_NORMAL implementation. */
> >
> > @@ -6107,14 +6123,17 @@ lookup_input_bundle(const struct ofproto_dpif *ofproto, uint16_t in_port,
> > * so in one special case.
> > */
> > static bool
> > -is_admissible(struct ofproto_dpif *ofproto, const struct flow *flow,
> > - struct ofport_dpif *in_port, uint16_t vlan, tag_type *tags)
> > +is_admissible(struct action_xlate_ctx *ctx, struct ofport_dpif *in_port,
> > + uint16_t vlan)
> > {
> > + struct ofproto_dpif *ofproto = ctx->ofproto;
> > + struct flow *flow = &ctx->flow;
> > struct ofbundle *in_bundle = in_port->bundle;
> >
> > /* Drop frames for reserved multicast addresses
> > * only if forward_bpdu option is absent. */
> > if (!ofproto->up.forward_bpdu && eth_addr_is_reserved(flow->dl_dst)) {
> > + xlate_report(ctx, "packet has reserved destination MAC, dropping");
> > return false;
> > }
> >
> > @@ -6122,11 +6141,12 @@ is_admissible(struct ofproto_dpif *ofproto, const struct flow *flow,
> > struct mac_entry *mac;
> >
> > switch (bond_check_admissibility(in_bundle->bond, in_port,
> > - flow->dl_dst, tags)) {
> > + flow->dl_dst, &ctx->tags)) {
> > case BV_ACCEPT:
> > break;
> >
> > case BV_DROP:
> > + xlate_report(ctx, "bonding refused admissibility, dropping");
> > return false;
> >
> > case BV_DROP_IF_MOVED:
> > @@ -6134,6 +6154,8 @@ is_admissible(struct ofproto_dpif *ofproto, const struct flow *flow,
> > if (mac && mac->port.p != in_bundle &&
> > (!is_gratuitous_arp(flow)
> > || mac_entry_is_grat_arp_locked(mac))) {
> > + xlate_report(ctx, "SLB bond thinks this packet looped back, "
> > + "dropping");
> > return false;
> > }
> > break;
> > @@ -6157,6 +6179,7 @@ xlate_normal(struct action_xlate_ctx *ctx)
> > in_bundle = lookup_input_bundle(ctx->ofproto, ctx->flow.in_port,
> > ctx->packet != NULL, &in_port);
> > if (!in_bundle) {
> > + xlate_report(ctx, "no input bundle, dropping");
> > return;
> > }
> >
> > @@ -6169,6 +6192,7 @@ xlate_normal(struct action_xlate_ctx *ctx)
> > "VLAN tag received on port %s",
> > ctx->ofproto->up.name, in_bundle->name);
> > }
> > + xlate_report(ctx, "partial VLAN tag, dropping");
> > return;
> > }
> >
> > @@ -6180,19 +6204,20 @@ xlate_normal(struct action_xlate_ctx *ctx)
> > "%s, which is reserved exclusively for mirroring",
> > ctx->ofproto->up.name, in_bundle->name);
> > }
> > + xlate_report(ctx, "input port is mirror output port, dropping");
> > return;
> > }
> >
> > /* Check VLAN. */
> > vid = vlan_tci_to_vid(ctx->flow.vlan_tci);
> > if (!input_vid_is_valid(vid, in_bundle, ctx->packet != NULL)) {
> > + xlate_report(ctx, "disallowed VLAN VID for this input port, dropping");
> > return;
> > }
> > vlan = input_vid_to_vlan(in_bundle, vid);
> >
> > /* Check other admissibility requirements. */
> > - if (in_port &&
> > - !is_admissible(ctx->ofproto, &ctx->flow, in_port, vlan, &ctx->tags)) {
> > + if (in_port && !is_admissible(ctx, in_port, vlan)) {
> > return;
> > }
> >
> > @@ -6206,11 +6231,15 @@ xlate_normal(struct action_xlate_ctx *ctx)
> > &ctx->tags);
> > if (mac) {
> > if (mac->port.p != in_bundle) {
> > + xlate_report(ctx, "forwarding to learned port");
> > output_normal(ctx, mac->port.p, vlan);
> > + } else {
> > + xlate_report(ctx, "learned port is input port, dropping");
> > }
> > } else {
> > struct ofbundle *bundle;
> >
> > + xlate_report(ctx, "no learned MAC for destination, flooding");
> > HMAP_FOR_EACH (bundle, hmap_node, &ctx->ofproto->bundles) {
> > if (bundle != in_bundle
> > && ofbundle_includes_vlan(bundle, vlan)
> > @@ -6601,6 +6630,17 @@ trace_resubmit(struct action_xlate_ctx *ctx, struct rule_dpif *rule)
> > }
> >
> > static void
> > +trace_report(struct action_xlate_ctx *ctx, const char *s)
> > +{
> > + struct trace_ctx *trace = CONTAINER_OF(ctx, struct trace_ctx, ctx);
> > + struct ds *result = trace->result;
> > +
> > + ds_put_char_multiple(result, '\t', ctx->recurse);
> > + ds_put_cstr(result, s);
> > + ds_put_char(result, '\n');
> > +}
> > +
> > +static void
> > ofproto_unixctl_trace(struct unixctl_conn *conn, int argc, const char *argv[],
> > void *aux OVS_UNUSED)
> > {
> > @@ -6750,6 +6790,7 @@ ofproto_trace(struct ofproto_dpif *ofproto, const struct flow *flow,
> > action_xlate_ctx_init(&trace.ctx, ofproto, flow, initial_tci,
> > rule, tcp_flags, packet);
> > trace.ctx.resubmit_hook = trace_resubmit;
> > + trace.ctx.report_hook = trace_report;
> > xlate_actions(&trace.ctx, rule->up.ofpacts, rule->up.ofpacts_len,
> > &odp_actions);
> >
> > --
> > 1.7.2.5
> >
> > _______________________________________________
> > dev mailing list
> > dev at openvswitch.org
> > http://openvswitch.org/mailman/listinfo/dev
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